Writing instrument



FIG. 1 is a perspective view of the writing instrument;

FIG. 2 is a front view of the writing instrument;

FIG. 3 is a right side view of the writing instrument;

FIG. 4 is a rear view of the writing instrument;

FIG. 5 is a left side view of the writing instrument;

FIG. 6 is a top plan view of the writing instrument;

FIG. 7 is a bottom view of the writing instrument;

FIG. 8 is a front view of the writing instrument with its cap removed; and,

FIG. 9 is a sectional view of the writing instrument taken along line A--A in FIG. 2. 

The ornamental design for a writing instrument, as shown and described. 